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</head><body bgcolor="#FFFFFF" text="#000000">Hey Jay,<br>
<br>
So at the 4:35 mark of this quick review of available LFP batteries on
the market at the time (2019) - Will Prowess states that "they (Relion)
are the only battery that has a built-in battery heater (I think he was
implying as standard equipment and not an option).<br>
<br>
Is it possible the battery heater circuit stuck on?<br>
<br>
<a href="https://www.youtube.com/watch?v=gOqQp2Xjr6U&t=372s">https://www.youtube.com/watch?v=gOqQp2Xjr6U&t=372s</a><br>
<br>
Just a thought - not sure how you would go back and check that out
though!<br>
<br>
Best,<br>
<br>
Jeff C.<br>
Village Power Design<br>
<span>
</span><br>
<blockquote type="cite"
cite="mid:84eff0c0269d28f1b0a925443136ca16@127.0.0.1" style="border: 0px
none ! important;">
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<a style="color:#485664
!important;padding-right:6px;font-weight:500;text-decoration:none
!important;" href="mailto:offgridsolar@sti.net" moz-do-not-send="true">Dave
Angelini Offgrid Solar</a></div> <div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">June
17, 2021 at 5:01 PM</span></font></div> </div></div>
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style="color:#909AA4;margin-left:24px;margin-right:24px;">
<meta http-equiv="content-type" content="text/html; charset=utf-8"><p>I
thought of a few more ways this could have happened. The installer over
torqued the battery terminals. There was not SPD protection in the
system and it got zapped and escalated. Working on SPD's now for a guy.
He does not see the value and knows everything! Pretty hot out here in
the West! 5PM ! Take care! Cheers!</p>
<p>----------------------------------------------------------------------------------------------------------------------------------------------</p>
<p> </p>
<div>Maybe the BMS was never tested by Relion for all of the possible
failure<br>modes? Maybe it was tested and it got thru QC. </div>
<div>I know very little about<br>this company. Do they meet the
standards like, <br><br>manufacturing facilities<br>are fully certified
to ISO 9001/14001 and OSHA 18001 standards. <br><br>Meets UL<br>9540 <br><br>CERTIFICATION
STANDARDS <br><br> * IEC 62133<br> * UL 1973<br> *
UL 2271<br> *<br>CE<br> * UN 38.3<br><br>Not trying to be
a pain either Jay. You know the LFP I use!<br>Good Luck!</div>
<p> </p>
<div>
<div> </div>
<div><strong><span style="font-size: small;">Dave Angelini Offgrid Solar<br>"we
go where powerlines don't"<br><a
href="http://members.sti.net/offgridsolar/" target="_blank"
moz-do-not-send="true">http://members.sti.net/offgridsolar/</a><br>e-mail
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209 813 0060</span></strong></div>
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<p>On Thu, 17 Jun 2021 11:55:35 -0600, jay <a class="moz-txt-link-rfc2396E" href="mailto:jay.peltz@gmail.com"><jay.peltz@gmail.com></a>
wrote:</p>
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<a style="color:#485664
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<div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">June
17, 2021 at 10:55 AM</span></font></div> </div></div>
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style="color:#909AA4;margin-left:24px;margin-right:24px;"><meta
http-equiv="Content-Type" content="text/html; charset=utf-8">HI All,<div
class=""><br class=""></div><div class="">The cover never got all the
way off before it was blown off, it was just started to be opened, so no
way there was an external ignition source. If it was an explosion it
was all from internal components except for possibly some O2 coming from
the outside.</div><div class=""><br class=""></div><div class="">My
other question still hasn\u2019t been answered. </div><div class="">If the
BMS isn\u2019t taking care of over/under voltage and over current what is it
doing to prevent damage to the battery?</div><div class="">( this system
was within the input PV or output inverter watts/amps of the battery
specifications) And I just found out that on the day of failure, no one
has been living there for months and only a grundfos SQFlex and a few
lights were on, no big loads. </div><div class=""><br class=""></div><div
class="">Now maybe I\u2019ve been under the false understanding that this is
the primary job of the BMS? </div><div class="">Yes I know that there
is also cell balancing, % monitoring, blue tooth, wifi etc that can be
included in the BMS but to me thats all secondary.</div><div class=""><br
class=""></div><div class="">Hopefully someone can clear this up for
me.</div><div class=""><br class=""></div><div class="">jay</div><div
class=""><br class=""></div><div class=""><br class=""></div><div
class=""><br class=""></div><div class=""><br class=""></div><div
class=""><div><br class=""></div><br class=""></div>
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Angelini Offgrid Solar</a></div> <div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">June
17, 2021 at 7:01 AM</span></font></div> </div></div>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"><p>My
.02 on this, and just a guess, the open loop charging parameters were
not set right or charge limits for the battery were too high. The other
way to kill LFP is large loads exceeding the battery max discharge
current.</p>
<p>Closing the loop eliminates just about all of those issues. It brings
the battery into the safety area of LA batteries that are still hard to
beat offgrid. I am not saying you can't blow the top off a LA battery
either<img title="Wink"
src="cid:part7.9EA6BCF3.575CE0C3@villagepowerdesign.com" alt="Wink"
name="image.png" border="0"></p>
<div>
<div> </div>
<div><strong><span style="font-size: small;">Dave Angelini Offgrid Solar<br>"we
go where powerlines don't"<br><a
href="http://members.sti.net/offgridsolar/" target="_blank"
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<p>On Thu, 17 Jun 2021 07:23:07 -0400, John Blittersdorf
<a class="moz-txt-link-rfc2396E" href="mailto:john.blittersdorf@gmail.com"><john.blittersdorf@gmail.com></a> wrote:</p>
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17, 2021 at 4:23 AM</span></font></div> </div></div>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"><div
dir="auto">This just proves the weak link is the BMS.</div><div
dir="auto">I had the honor of replacing the BMS in that exact model in a
stack of 3 batteries. Luckily it was on the bottom shelf so I could
pull the monster out onto the floor to get access to the lid. The lid
is sealed shut but with persistence it opened. I was working with their
tech support and following their instructions. I disconnected it from
the other two that were in a parallel configuration before opening.
Battery voltage was zero at the terminals. I did voltage checks at
various checkpoints to confirm it was the BMS at fault. Relion sent a
new BMS which I carefully installed and it has worked fine since. Had I
seen this photo first, I may have not been so eager to see the inside
of that battery. </div><div dir="auto"><br></div><div dir="auto">John
Blittersdorf</div><div><br></div>
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<a style="color:#485664
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<div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">June
16, 2021 at 12:22 PM</span></font></div> </div></div>
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style="color:#909AA4;margin-left:24px;margin-right:24px;"><meta
http-equiv="Content-Type" content="text/html; charset=utf-8">Hi Jeff,<div
class=""><br class=""></div><div class="">I don\u2019t know if you saw the
photo. No cutting involved.</div><div class="">The top is removed with
roughly 14 fasteners. </div><div class="">No tools or prying was
involved in the removal of the top cover.</div><div class=""><br
class=""></div><div class="">jay</div><div class=""><div><br class=""></div><br
class=""></div>
</div>
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